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binutils-gdb/bfd/elf32-msp430.c

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/* MSP430-specific support for 32-bit ELF
Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
Contributed by Dmitry Diky <diwil@mail.ru>
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libiberty.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/msp430.h"
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
PARAMS ((bfd *, bfd_reloc_code_real_type));
static void msp430_info_to_howto_rela
PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
static asection *elf32_msp430_gc_mark_hook
PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
struct elf_link_hash_entry *, Elf_Internal_Sym *));
static bfd_boolean elf32_msp430_gc_sweep_hook
PARAMS ((bfd *, struct bfd_link_info *, asection *,
const Elf_Internal_Rela *));
static bfd_boolean elf32_msp430_check_relocs
PARAMS ((bfd *, struct bfd_link_info *, asection *,
const Elf_Internal_Rela *));
static bfd_reloc_status_type msp430_final_link_relocate
PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, bfd_vma));
static bfd_boolean elf32_msp430_relocate_section
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static void bfd_elf_msp430_final_write_processing
PARAMS ((bfd *, bfd_boolean));
static bfd_boolean elf32_msp430_object_p
PARAMS ((bfd *));
static void elf32_msp430_post_process_headers
PARAMS ((bfd *, struct bfd_link_info *));
/* Use RELA instead of REL. */
#undef USE_REL
static reloc_howto_type elf_msp430_howto_table[] =
{
HOWTO (R_MSP430_NONE, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MSP430_NONE", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_MSP430_32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MSP430_32", /* name */
FALSE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 13 bit PC relative relocation. */
HOWTO (R_MSP430_10_PCREL, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
10, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MSP430_13_PCREL", /* name */
FALSE, /* partial_inplace */
0xfff, /* src_mask */
0xfff, /* dst_mask */
TRUE), /* pcrel_offset */
/* A 16 bit absolute relocation. */
HOWTO (R_MSP430_16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MSP430_16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 16 bit absolute relocation for command address. */
HOWTO (R_MSP430_16_PCREL, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MSP430_16_PCREL", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
TRUE), /* pcrel_offset */
/* A 16 bit absolute relocation, byte operations. */
HOWTO (R_MSP430_16_BYTE, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MSP430_16_BYTE", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 16 bit absolute relocation for command address. */
HOWTO (R_MSP430_16_PCREL_BYTE,/* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MSP430_16_PCREL_BYTE", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
TRUE) /* pcrel_offset */
};
/* Map BFD reloc types to MSP430 ELF reloc types. */
struct msp430_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned int elf_reloc_val;
};
static const struct msp430_reloc_map msp430_reloc_map[] =
{
{BFD_RELOC_NONE, R_MSP430_NONE},
{BFD_RELOC_32, R_MSP430_32},
{BFD_RELOC_MSP430_10_PCREL, R_MSP430_10_PCREL},
{BFD_RELOC_16, R_MSP430_16_BYTE},
{BFD_RELOC_MSP430_16_PCREL, R_MSP430_16_PCREL},
{BFD_RELOC_MSP430_16, R_MSP430_16},
{BFD_RELOC_MSP430_16_PCREL_BYTE, R_MSP430_16_PCREL_BYTE},
{BFD_RELOC_MSP430_16_BYTE, R_MSP430_16_BYTE}
};
static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
bfd *abfd ATTRIBUTE_UNUSED;
bfd_reloc_code_real_type code;
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE (msp430_reloc_map); i++)
if (msp430_reloc_map[i].bfd_reloc_val == code)
return &elf_msp430_howto_table[msp430_reloc_map[i].elf_reloc_val];
return NULL;
}
/* Set the howto pointer for an MSP430 ELF reloc. */
static void
msp430_info_to_howto_rela (abfd, cache_ptr, dst)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *cache_ptr;
Elf_Internal_Rela *dst;
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
BFD_ASSERT (r_type < (unsigned int) R_MSP430_max);
cache_ptr->howto = &elf_msp430_howto_table[r_type];
}
static asection *
elf32_msp430_gc_mark_hook (sec, info, rel, h, sym)
asection *sec;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
Elf_Internal_Rela *rel;
struct elf_link_hash_entry *h;
Elf_Internal_Sym *sym;
{
if (h != NULL)
{
switch (ELF32_R_TYPE (rel->r_info))
{
default:
switch (h->root.type)
{
case bfd_link_hash_defined:
case bfd_link_hash_defweak:
return h->root.u.def.section;
case bfd_link_hash_common:
return h->root.u.c.p->section;
default:
break;
}
}
}
else
return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
return NULL;
}
static bfd_boolean
elf32_msp430_gc_sweep_hook (abfd, info, sec, relocs)
bfd *abfd ATTRIBUTE_UNUSED;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
asection *sec ATTRIBUTE_UNUSED;
const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
{
/* We don't use got and plt entries for msp430. */
return TRUE;
}
/* Look through the relocs for a section during the first phase.
Since we don't do .gots or .plts, we just need to consider the
virtual table relocs for gc. */
static bfd_boolean
elf32_msp430_check_relocs (abfd, info, sec, relocs)
bfd *abfd;
struct bfd_link_info *info;
asection *sec;
const Elf_Internal_Rela *relocs;
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
const Elf_Internal_Rela *rel;
const Elf_Internal_Rela *rel_end;
if (info->relocatable)
return TRUE;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (abfd);
sym_hashes_end =
sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
if (!elf_bad_symtab (abfd))
sym_hashes_end -= symtab_hdr->sh_info;
rel_end = relocs + sec->reloc_count;
for (rel = relocs; rel < rel_end; rel++)
{
struct elf_link_hash_entry *h;
unsigned long r_symndx;
r_symndx = ELF32_R_SYM (rel->r_info);
if (r_symndx < symtab_hdr->sh_info)
h = NULL;
else
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
}
return TRUE;
}
/* Perform a single relocation. By default we use the standard BFD
routines, but a few relocs, we have to do them ourselves. */
static bfd_reloc_status_type
msp430_final_link_relocate (howto, input_bfd, input_section,
contents, rel, relocation)
reloc_howto_type *howto;
bfd *input_bfd;
asection *input_section;
bfd_byte *contents;
Elf_Internal_Rela *rel;
bfd_vma relocation;
{
bfd_reloc_status_type r = bfd_reloc_ok;
bfd_vma x;
bfd_signed_vma srel;
switch (howto->type)
{
case R_MSP430_10_PCREL:
contents += rel->r_offset;
srel = (bfd_signed_vma) relocation;
srel += rel->r_addend;
srel -= rel->r_offset;
srel -= 2; /* Branch instructions add 2 to the PC... */
srel -= (input_section->output_section->vma +
input_section->output_offset);
if (srel & 1)
return bfd_reloc_outofrange;
/* MSP430 addresses commands as words. */
srel >>= 1;
/* Check for an overflow. */
if (srel < -512 || srel > 511)
return bfd_reloc_overflow;
x = bfd_get_16 (input_bfd, contents);
x = (x & 0xfc00) | (srel & 0x3ff);
bfd_put_16 (input_bfd, x, contents);
break;
case R_MSP430_16_PCREL:
contents += rel->r_offset;
srel = (bfd_signed_vma) relocation;
srel += rel->r_addend;
srel -= rel->r_offset;
/* Only branch instructions add 2 to the PC... */
srel -= (input_section->output_section->vma +
input_section->output_offset);
if (srel & 1)
return bfd_reloc_outofrange;
bfd_put_16 (input_bfd, srel & 0xffff, contents);
break;
case R_MSP430_16_PCREL_BYTE:
contents += rel->r_offset;
srel = (bfd_signed_vma) relocation;
srel += rel->r_addend;
srel -= rel->r_offset;
/* Only branch instructions add 2 to the PC... */
srel -= (input_section->output_section->vma +
input_section->output_offset);
bfd_put_16 (input_bfd, srel & 0xffff, contents);
break;
case R_MSP430_16_BYTE:
contents += rel->r_offset;
srel = (bfd_signed_vma) relocation;
srel += rel->r_addend;
bfd_put_16 (input_bfd, srel & 0xffff, contents);
break;
case R_MSP430_16:
contents += rel->r_offset;
srel = (bfd_signed_vma) relocation;
srel += rel->r_addend;
if (srel & 1)
return bfd_reloc_notsupported;
bfd_put_16 (input_bfd, srel & 0xffff, contents);
break;
default:
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
contents, rel->r_offset,
relocation, rel->r_addend);
}
return r;
}
/* Relocate an MSP430 ELF section. */
static bfd_boolean
elf32_msp430_relocate_section (output_bfd, info, input_bfd, input_section,
contents, relocs, local_syms, local_sections)
bfd *output_bfd ATTRIBUTE_UNUSED;
struct bfd_link_info *info;
bfd *input_bfd;
asection *input_section;
bfd_byte *contents;
Elf_Internal_Rela *relocs;
Elf_Internal_Sym *local_syms;
asection **local_sections;
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
Elf_Internal_Rela *rel;
Elf_Internal_Rela *relend;
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (input_bfd);
relend = relocs + input_section->reloc_count;
for (rel = relocs; rel < relend; rel++)
{
reloc_howto_type *howto;
unsigned long r_symndx;
Elf_Internal_Sym *sym;
asection *sec;
struct elf_link_hash_entry *h;
bfd_vma relocation;
bfd_reloc_status_type r;
const char *name = NULL;
int r_type;
/* This is a final link. */
r_type = ELF32_R_TYPE (rel->r_info);
r_symndx = ELF32_R_SYM (rel->r_info);
howto = elf_msp430_howto_table + ELF32_R_TYPE (rel->r_info);
h = NULL;
sym = NULL;
sec = NULL;
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
sec = local_sections[r_symndx];
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
name = bfd_elf_string_from_elf_section
(input_bfd, symtab_hdr->sh_link, sym->st_name);
name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
}
else
{
bfd_boolean unresolved_reloc, warned;
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
r_symndx, symtab_hdr, sym_hashes,
h, sec, relocation,
unresolved_reloc, warned);
}
r = msp430_final_link_relocate (howto, input_bfd, input_section,
contents, rel, relocation);
if (r != bfd_reloc_ok)
{
const char *msg = (const char *) NULL;
switch (r)
{
case bfd_reloc_overflow:
r = info->callbacks->reloc_overflow
(info, name, howto->name, (bfd_vma) 0,
input_bfd, input_section, rel->r_offset);
break;
case bfd_reloc_undefined:
r = info->callbacks->undefined_symbol
(info, name, input_bfd, input_section, rel->r_offset, TRUE);
break;
case bfd_reloc_outofrange:
msg = _("internal error: out of range error");
break;
case bfd_reloc_notsupported:
msg = _("internal error: unsupported relocation error");
break;
case bfd_reloc_dangerous:
msg = _("internal error: dangerous relocation");
break;
default:
msg = _("internal error: unknown error");
break;
}
if (msg)
r = info->callbacks->warning
(info, msg, name, input_bfd, input_section, rel->r_offset);
if (!r)
return FALSE;
}
}
return TRUE;
}
/* The final processing done just before writing out a MSP430 ELF object
file. This gets the MSP430 architecture right based on the machine
number. */
static void
bfd_elf_msp430_final_write_processing (abfd, linker)
bfd *abfd;
bfd_boolean linker ATTRIBUTE_UNUSED;
{
unsigned long val;
switch (bfd_get_mach (abfd))
{
default:
case bfd_mach_msp110:
val = E_MSP430_MACH_MSP430x11x1;
break;
case bfd_mach_msp11:
val = E_MSP430_MACH_MSP430x11;
break;
case bfd_mach_msp12:
val = E_MSP430_MACH_MSP430x12;
break;
case bfd_mach_msp13:
val = E_MSP430_MACH_MSP430x13;
break;
case bfd_mach_msp14:
val = E_MSP430_MACH_MSP430x14;
break;
case bfd_mach_msp15:
val = E_MSP430_MACH_MSP430x15;
break;
case bfd_mach_msp16:
val = E_MSP430_MACH_MSP430x16;
break;
case bfd_mach_msp31:
val = E_MSP430_MACH_MSP430x31;
break;
case bfd_mach_msp32:
val = E_MSP430_MACH_MSP430x32;
break;
case bfd_mach_msp33:
val = E_MSP430_MACH_MSP430x33;
break;
case bfd_mach_msp41:
val = E_MSP430_MACH_MSP430x41;
break;
case bfd_mach_msp42:
val = E_MSP430_MACH_MSP430x42;
break;
case bfd_mach_msp43:
val = E_MSP430_MACH_MSP430x43;
break;
case bfd_mach_msp44:
val = E_MSP430_MACH_MSP430x44;
break;
}
elf_elfheader (abfd)->e_machine = EM_MSP430;
elf_elfheader (abfd)->e_flags &= ~EF_MSP430_MACH;
elf_elfheader (abfd)->e_flags |= val;
}
/* Set the right machine number. */
static bfd_boolean
elf32_msp430_object_p (abfd)
bfd *abfd;
{
int e_set = bfd_mach_msp14;
if (elf_elfheader (abfd)->e_machine == EM_MSP430
|| elf_elfheader (abfd)->e_machine == EM_MSP430_OLD)
{
int e_mach = elf_elfheader (abfd)->e_flags & EF_MSP430_MACH;
switch (e_mach)
{
default:
case E_MSP430_MACH_MSP430x11:
e_set = bfd_mach_msp11;
break;
case E_MSP430_MACH_MSP430x11x1:
e_set = bfd_mach_msp110;
break;
case E_MSP430_MACH_MSP430x12:
e_set = bfd_mach_msp12;
break;
case E_MSP430_MACH_MSP430x13:
e_set = bfd_mach_msp13;
break;
case E_MSP430_MACH_MSP430x14:
e_set = bfd_mach_msp14;
break;
case E_MSP430_MACH_MSP430x15:
e_set = bfd_mach_msp15;
break;
case E_MSP430_MACH_MSP430x16:
e_set = bfd_mach_msp16;
break;
case E_MSP430_MACH_MSP430x31:
e_set = bfd_mach_msp31;
break;
case E_MSP430_MACH_MSP430x32:
e_set = bfd_mach_msp32;
break;
case E_MSP430_MACH_MSP430x33:
e_set = bfd_mach_msp33;
break;
case E_MSP430_MACH_MSP430x41:
e_set = bfd_mach_msp41;
break;
case E_MSP430_MACH_MSP430x42:
e_set = bfd_mach_msp42;
break;
case E_MSP430_MACH_MSP430x43:
e_set = bfd_mach_msp43;
break;
case E_MSP430_MACH_MSP430x44:
e_set = bfd_mach_msp44;
break;
}
}
return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set);
}
static void
elf32_msp430_post_process_headers (abfd, link_info)
bfd *abfd;
struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
{
Elf_Internal_Ehdr *i_ehdrp; /* ELF file header, internal form. */
i_ehdrp = elf_elfheader (abfd);
#ifndef ELFOSABI_STANDALONE
#define ELFOSABI_STANDALONE 255
#endif
i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_STANDALONE;
}
#define ELF_ARCH bfd_arch_msp430
#define ELF_MACHINE_CODE EM_MSP430
#define ELF_MACHINE_ALT1 EM_MSP430_OLD
#define ELF_MAXPAGESIZE 1
#define TARGET_LITTLE_SYM bfd_elf32_msp430_vec
#define TARGET_LITTLE_NAME "elf32-msp430"
#define elf_info_to_howto msp430_info_to_howto_rela
#define elf_info_to_howto_rel NULL
#define elf_backend_relocate_section elf32_msp430_relocate_section
#define elf_backend_gc_mark_hook elf32_msp430_gc_mark_hook
#define elf_backend_gc_sweep_hook elf32_msp430_gc_sweep_hook
#define elf_backend_check_relocs elf32_msp430_check_relocs
#define elf_backend_can_gc_sections 1
#define elf_backend_final_write_processing bfd_elf_msp430_final_write_processing
#define elf_backend_object_p elf32_msp430_object_p
#define elf_backend_post_process_headers elf32_msp430_post_process_headers
#include "elf32-target.h"
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